Question

当使用Slick和H2内存数据库将UUID用作主键时，出现以下错误。我试图调试这几天，但没有运气：

Data conversion error converting "00000000-0000-0000-0000-000000000001"

以下是可以重现此问题的代码：

import java.util.UUID

import slick.driver.H2Driver.api._

import scala.concurrent.Await
import scala.concurrent.duration.Duration

object Main {

  class Tasks(tag: Tag) extends Table[(String, Option[UUID])](tag, "tasks") {
    def name: Rep[String] = column[String]("name")

    def id = column[UUID]("id", O.SqlType("UUID"), O.PrimaryKey, O.AutoInc)

    def * = (name, id ?)
  }

  def main(args: Array[String]) {
    val db = Database.forURL("jdbc:h2:mem:test;MODE=PostgreSQL", driver = "org.h2.Driver")

    try {
      val tasks = TableQuery[Tasks]
      println("Create table: " + tasks.schema.create.statements.mkString("|"))
      val setupAction: DBIO[Unit] = DBIO.seq(
        tasks.schema.create,
        tasks.+=("foo", None)
      )

      Await.result(db.run(setupAction), Duration.Inf)
    } finally db.close
  }
}

有人可以在这里提供一些帮助吗？

---更新---

表创建查询如下：

create table "tasks" ("name" VARCHAR NOT NULL,"id" UUID GENERATED BY DEFAULT AS IDENTITY(START WITH 1) NOT NULL PRIMARY KEY)

完整的堆栈跟踪如下：

Exception in thread "main" org.h2.jdbc.JdbcSQLException: Data conversion error converting "00000000-0000-0000-0000-000000000001"; SQL statement:
insert into "tasks" ("name")  values (?) [22018-187]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
    at org.h2.message.DbException.get(DbException.java:168)
    at org.h2.value.Value.convertTo(Value.java:902)
    at org.h2.value.Value.getLong(Value.java:443)
    at org.h2.table.Column.updateSequenceIfRequired(Column.java:339)
    at org.h2.table.Column.validateConvertUpdateSequence(Column.java:331)
    at org.h2.table.Table.validateConvertUpdateSequence(Table.java:737)
    at org.h2.command.dml.Insert.insertRows(Insert.java:151)
    at org.h2.command.dml.Insert.update(Insert.java:114)
    at org.h2.command.CommandContainer.update(CommandContainer.java:78)
    at org.h2.command.Command.executeUpdate(Command.java:254)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:157)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:143)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl$SingleInsertAction$$anonfun$run$7.apply(JdbcActionComponent.scala:507)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl$SingleInsertAction$$anonfun$run$7.apply(JdbcActionComponent.scala:504)
    at slick.jdbc.JdbcBackend$SessionDef$class.withPreparedStatement(JdbcBackend.scala:347)
    at slick.jdbc.JdbcBackend$BaseSession.withPreparedStatement(JdbcBackend.scala:407)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl.preparedInsert(JdbcActionComponent.scala:498)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl$SingleInsertAction.run(JdbcActionComponent.scala:504)
    at slick.driver.JdbcActionComponent$SimpleJdbcDriverAction.run(JdbcActionComponent.scala:32)
    at slick.driver.JdbcActionComponent$SimpleJdbcDriverAction.run(JdbcActionComponent.scala:29)
    at slick.dbio.DBIOAction$$anon$4$$anonfun$run$3.apply(DBIOAction.scala:214)
    at slick.dbio.DBIOAction$$anon$4$$anonfun$run$3.apply(DBIOAction.scala:214)
    at scala.collection.Iterator$class.foreach(Iterator.scala:727)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
    at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
    at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
    at slick.dbio.DBIOAction$$anon$4.run(DBIOAction.scala:214)
    at slick.dbio.DBIOAction$$anon$4.run(DBIOAction.scala:212)
    at slick.backend.DatabaseComponent$DatabaseDef$$anon$2.liftedTree1$1(DatabaseComponent.scala:237)
    at slick.backend.DatabaseComponent$DatabaseDef$$anon$2.run(DatabaseComponent.scala:237)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NumberFormatException: For input string: "00000000-0000-0000-0000-000000000001"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Long.parseLong(Long.java:589)
    at java.lang.Long.parseLong(Long.java:631)
    at org.h2.value.Value.convertTo(Value.java:854)
    ... 31 more

Answer 1

你有一个奇怪的＆＃34;创建表＆＃34;具有UUID类型序列的语句。没有数据库支持。您需要使用例如：

create table tasks (name VARCHAR NOT NULL,
  id UUID DEFAULT RANDOM_UUID() NOT NULL PRIMARY KEY);
insert into tasks(name) values('Hello');
select * from tasks;

但随机生成的主键很慢，我建议回到常规序列。

P.S。在这里问了同样的问题：https://github.com/h2database/h2database/issues/303

Answer 2

除托马斯回答外，另一种选择是将类型从uuid更改为begint：

create table "tasks" (
  "name" VARCHAR                                                NOT NULL,
  "id"   BIGINT GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL PRIMARY KEY
);

当表由Slick / Hibernate等生成时，您可能无法编写自己的SQL。不过，更改类型可能是可行的选择。

使用UUID作为主键时H2内存数据库错误“数据转换错误转换”

2 个答案: